Read about java application performance tuning interview questions, The latest news, videos, and discussion topics about java application performance tuning interview questions from alibabacloud.com
Java's current heat has declined, but there are still a lot of people who learn java. Java's post is also a lot of infiltration. So, those classic Java knowledge points, you can see the problem can say 123? Come and have a look.The difference between 1.JDK and JRE What is the difference between 2.final, finally, and finalize?3. The difference between threads and processesHow does the HashMap in 4.
. When the session information on a node is modified, the session is broadcast to other Tomcat nodes to keep the session synchronized. Disadvantage is that the network is prone to busy, affecting the efficiency of the system;6. Mature high-availability system solution: Terracotta, which is the Java open source software, a cross-JVM virtual machine dedicated to the distributed cache framework, using it can also be used to achieve tomcat session sharing
There are very few courses on Java performance Tuning, so a comprehensive and in-depth introduction to Java performance Tuning, North wind is exclusive, special lecturer, more than 10 years of
file , because the subsequent startup parameters will handle the java_opts as the JVM's startup parameters. The memory structure of the Java Virtual machine is a bit complex, I believe many people in the understanding is very abstract, it is mainly divided into heap, stack, method area and garbage collection system, such as a few parts, the following is my from the online grilled memory structure diagram:Memory t
consumption. At the cost of a single performance loss, but because it reduces CPU consumption, for multi-threaded applications, it improves the overall average performance.(Similar scenarios in actual Java applications, where the best way to do this is to use the wait/notify mechanism instead)For other similar cycles too many times, regular, calculation and so o
1 , what are the aspects of object-oriented features ? The object-oriented programming language has 4 main features: encapsulation, inheritance, abstraction, polymorphism, etc.Details:http://www.cnblogs.com/guweiwei/p/6599289.html2 , access modifiers public,private,protected, and what is the difference between not writing (the default)? Defaults to default when members of a class do not write access adornments. The default is equivalent to exposing (public) to other classes in the same packag
Java Architects interview questions, how to become architectsOften interview some candidates, sorted out my interview using the topic, LU continued to organize a lot of problems, so each time to draw a part to ask. The answer will be gradually released in later articles.
B
:
The above can solve the POST request garbled problem. There are two garbled methods for GET request Chinese parameter:Modify the Tomcat profile add code to match the project code as follows:
Another way to re-encode parameters:
StringuserName =newString (Request.getparamter ("UserName"). GetBytes ("Iso8859-1"), "Utf-8")
Iso8859-1 is the tomcat default encoding, and the Tomcat encoded content needs to be encoded by utf-8What is
Program | index | performance
You can use SQL Server adjuster (SQL Server Profiler) tools to collect important information about the current activity of the server. The information tracked by this profiler tool, which contains the real load of the database, can be used on a variety of occasions. Now let's look at how to use Profiler to collect the data that can be used by the Index Tuning Wizard and how you
Let's talk about some questions about the java programmer interview.
This blog post is intended for recent graduates and java programmers who have been working for about two or three years.
Why do I need to change jobs?
This is a broad question. Everyone has an answer.
For example:
The company is not well-treated,
The
Performance issues with Java EE applications are a very important issue for serious projects and products. In particular, enterprise-class applications, concurrent users, a large number of data transmission, business logic complex, occupy more system resources, so performance problems in enterprise-class applications become critical, it and the stability of the s
Most developers take for granted that performance optimization is complex and requires a lot of experience and knowledge. Well, you can't say it's completely wrong. Optimizing your application for optimal performance is not an easy task. But that doesn't mean that if you don't have the knowledge, you can't do anything. Here are 11 easy-to-follow recommendations a
The author of this book is a leader in Java performance and Java HotSpot virtual machines, helping you to use modern soft practices to improve your practical life by summarizing energy, avoiding common mistakes, and tips and tricks.Using G1 to overcome the limitations of parallel, serial, and CMS garbage collectors learn about the various stages of G1 GC collecti
Java Collections Interview QuestionsIn Java, collection interview questions is mostly asked by the interviewers. Here are the list of mostly asked collections interview questions with a
compressing and extending the heap space:-xx:minheapfreeratio: Sets the minimum idle scale for heap space. The default is 40. When the free memory in the heap space is less than this value, the JVM expands the heap space.-xx:maxheapfreeratio: Sets the maximum idle scale for heap space. The default is 70. When the free memory in the heap space is greater than this value, the heap space is compressed and a smaller heap is obtained.When-xms and-xmx are equal, both parameters of-xx:minheapfreeratio
, connection pooling, and so on, in the design phase, as appropriate for the business. 2. Code tuning: Development PhaseThis is the developer is most familiar with, do the overloading should have feelings, the same function, good implementation and bad implementation is very far. be careful to avoid deadlocks, dead loops. 3. Database tuning: Development phaseJava programs can connect to a database using JDB
understand the process of solving the problem, and find out what the individual has done, how to do, and what has been harvested. This is the accumulation of experience. The company ultimately needs to contribute to the work of the staff, so the need for experienced people to help solve the problem, then the ability to solve problems and thinking is very important. For students who do not have much experience, such as a new graduate or an intern, then they need a good foundation and some person
interface requires the passing of two object parameters, if the first parameter is smaller than the second, a negative integer is returned, if the first one equals the second, 0 is returned, and if the first one is larger than the second, a positive integer is returned.What is the difference between 34.Comparable and comparator interfaces?The comparable and comparator interfaces are used to sort object collections or arrays. The comparable interface is used to provide a natural ordering of obje
Multithreading and concurrency issues are one of the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp of
and data. Data access can only be performed through the defined interface. Object-oriented computing begins with the basic concept that the real world can be depicted as a series of completely autonomous and encapsulated objects that access other objects through a protected interface.4. Polymorphism:Polymorphism allows different types of objects to respond to the same message. Polymorphism includes parameterized polymorphism and inclusion polymorphism. The polymorphism language has the advantag
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.